[sdiy] Buchla 281 part substitutions?

[J Alexander]

Looking at Buchla 281 Quad Function Generator schemo on Magnus' site.  Dated 
1978.


Are these good substitutions?


Needed		       Sub

IC's
CD4016B		   CD4016BE
CD4001B	   	CD4001BE
CA3080 		    ECG902

Q
AD821		   	AD821AN,AD821AR

Diodes
IN5240		     IN5240B


Also:
-I need a substitution for a diode IN457

-The schemo calls for a diode numbered uA741, where 'u' is the micro symbol. 
  What is this part?  What to substitute?

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